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          <h1 class="post-title" itemprop="name headline">1、字符功能调用类(Character-Oriented Function)</h1>
        

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        <table><tbody><tr><td>01H、07H和08H —</td> <td>从标准输入设备输入字符</td></tr><tr><td>02H —</td> <td>字符输出</td></tr><tr><td>03H —</td> <td>辅助设备的输入</td></tr><tr><td>04H —</td> <td>辅助设备的输出</td></tr><tr><td>05H —</td> <td>打印输出</td></tr><tr><td>06H —</td> <td>控制台输入/输出</td></tr><tr><td>09H —</td> <td>显示字符串</td></tr><tr><td>0AH — </td> <td>键盘缓冲输入</td></tr><tr><td>0BH —</td> <td>检测输入状态</td></tr><tr><td>0CH —</td> <td>清输入缓冲区的输入功能</td></tr></tbody></table>

<h2 id="1-、功能01H、07H和08H"><a href="#1-、功能01H、07H和08H" class="headerlink" title="(1)、功能01H、07H和08H"></a>(1)、功能01H、07H和08H</h2><table><tbody><tr><td>功能描述：</td><td>从标准输入设备(如：键盘)读入一个字符。该中断在处理过程中将一直处于等待状态直到有字符可读为止。该输入还可被重定向，如果这样做，则无法判断文件是否已到文件尾</td></tr><tr><td>入口参数：</td><td>AH＝01H，过滤掉控制字符，并回显<br>　＝07H，不过滤掉控制字符，不回显<br>　＝08H，过滤掉控制字符，不回显</td></tr><tr><td>出口参数：</td><td>AL＝输入字符的ASCII码</td></tr></tbody></table>

<h2 id="2-、功能02H"><a href="#2-、功能02H" class="headerlink" title="(2)、功能02H"></a>(2)、功能02H</h2><table><tbody><tr><td>功能描述：</td><td>向标准输出设备(如：屏幕)输出一个字符。该输出还可被重定向，如果这样做，则将无法判断磁盘是否满</td></tr><tr><td>入口参数：</td><td>AH＝02H<br>DL＝待输出字符的ASCII码</td></tr><tr><td>出口参数：</td><td>无</td></tr></tbody></table>

<h2 id="3-、功能03H"><a href="#3-、功能03H" class="headerlink" title="(3)、功能03H"></a>(3)、功能03H</h2><table><tbody><tr><td>功能描述：</td><td>从辅助设备读入一个字符，该辅助设备的缺省值为COM1</td></tr><tr><td>入口参数：</td><td>AH＝03H</td></tr><tr><td>出口参数：</td><td>AL＝读入字符的ASCII码</td></tr></tbody></table>

<h2 id="4-、功能04H"><a href="#4-、功能04H" class="headerlink" title="(4)、功能04H"></a>(4)、功能04H</h2><table><tbody><tr><td>功能描述：</td><td>向辅助设备输出一个字符，该辅助设备的缺省值为COM1</td></tr><tr><td>入口参数：</td><td>AH＝04H<br>DL＝待输出字符的ASCII码</td></tr><tr><td>出口参数：</td><td>无</td></tr></tbody></table>

<h2 id="5-、功能05H"><a href="#5-、功能05H" class="headerlink" title="(5)、功能05H"></a>(5)、功能05H</h2><table><tbody><tr><td>功能描述：</td><td>向标准的输出设备输出一个字符。该缺省的输出设备为LPT1端口的打印机，除非用MODE命令来改变</td></tr><tr><td>入口参数：</td><td>AH＝05H<br>DL＝待输出字符的ASCII码</td></tr><tr><td>出口参数：</td><td>无</td></tr></tbody></table>

<h2 id="6-、功能06H"><a href="#6-、功能06H" class="headerlink" title="(6)、功能06H"></a>(6)、功能06H</h2><table><tbody><tr><td>功能描述：</td><td>控制台(如：键盘、屏幕)输入/输出。如果输入/输出操作被重定向，那么，将无法判断文件是否已到文件尾，或磁盘已满</td></tr><tr><td>入口参数：</td><td>AH＝06H，DL＝输入/输出功能选择</td></tr><tr><td>出口参数：</td><td>若DL＝00H-FEH，则此功能为输出，DL为待输出字符的ASCII码；<br>若DL＝0FFH，则此功能为输入，此时：若ZF＝1，则无字符可读，否则，AL＝读入字符的ASCII码</td></tr></tbody></table>

<h2 id="7-、功能09H"><a href="#7-、功能09H" class="headerlink" title="(7)、功能09H"></a>(7)、功能09H</h2><table><tbody><tr><td>功能描述：</td><td>输出一个字符串到标准输出设备上。如果输出操作被重定向，那么，将无法判断磁盘已满</td></tr><tr><td>入口参数：</td><td>AH＝09H<br>DS:DX＝待输出字符的地址<br>说明：待显示的字符串以’$’作为其结束标志</td></tr><tr><td>出口参数：</td><td>无</td></tr></tbody></table>

<h2 id="8-、功能0AH"><a href="#8-、功能0AH" class="headerlink" title="(8)、功能0AH"></a>(8)、功能0AH</h2><table><tbody><tr><td>功能描述：</td><td>从标准输入设备上读入一个字节字符串，遇到“回车键”结束输入(输入的字符在标准的输出设备上有回显)。如果该输入操作被重定向，那么，将无法判断文件是否已到文件尾</td></tr><tr><td>入口参数：</td><td>AH＝0AH<br>DS:DX＝存放输入字符的起始地址<br>接受输入字符串缓冲区的定义说明：<br>　　1、第一个字节为缓冲区的最大容量，可认为是入口参数；<br>　　2、第二个字节为实际输入的字符数(不包括回车键)，可看作出口参数；<br>　　3、从第三个字节开始存放实际输入的字符串；<br>　　4、字符串以回车键结束，回车符是接受的最后一个字符；<br>　　5、若输入的字符数超过缓冲区的最大容量，则多出的部分被丢弃，系统并发出响铃，直到输入“回车”键才结束输入。<p>例如：<br>　　BUFF　80, ?, 80 DUP(?)　　　;最多接受80个字符</p></td></tr><tr><td>出口参数：</td><td>无</td></tr></tbody></table>

<h2 id="9-、功能0BH"><a href="#9-、功能0BH" class="headerlink" title="(9)、功能0BH"></a>(9)、功能0BH</h2><table><tbody><tr><td>功能描述：</td><td>检查标准输入设备上是否有字符可读。该输入操作可被重定向</td></tr><tr><td>入口参数：</td><td>AH＝0BH</td></tr><tr><td>出口参数：</td><td>AL＝00H——无字符可读；FFH——有字符可读</td></tr></tbody></table>

<h2 id="10-、功能0CH"><a href="#10-、功能0CH" class="headerlink" title="(10)、功能0CH"></a>(10)、功能0CH</h2><table><tbody><tr><td>功能描述：</td><td>清空当前的标准输入缓冲区，再读入字符。其输入操作可被重定向</td></tr><tr><td>入口参数：</td><td>AH＝0CH<br>AL＝01H、06H、07H、08H或0AH</td></tr><tr><td>出口参数：</td><td>若入口参数AL为0AH，则DS:DX＝存放输入字符的起始地址，否则，出口参数AL＝输入字符的ASCII码</td></tr></tbody></table>

      
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